CN107755881B - Multi-layer tab laser welding device and process for power battery cover plate - Google Patents
Multi-layer tab laser welding device and process for power battery cover plate Download PDFInfo
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- CN107755881B CN107755881B CN201711225763.6A CN201711225763A CN107755881B CN 107755881 B CN107755881 B CN 107755881B CN 201711225763 A CN201711225763 A CN 201711225763A CN 107755881 B CN107755881 B CN 107755881B
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- 238000003466 welding Methods 0.000 title claims abstract description 180
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000003825 pressing Methods 0.000 claims abstract description 95
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 34
- 229910052782 aluminium Inorganic materials 0.000 claims description 34
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 32
- 239000011889 copper foil Substances 0.000 claims description 18
- 239000011888 foil Substances 0.000 claims description 18
- 229910052802 copper Inorganic materials 0.000 claims description 14
- 239000010949 copper Substances 0.000 claims description 14
- 238000001125 extrusion Methods 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 230000006835 compression Effects 0.000 abstract description 10
- 238000007906 compression Methods 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/03—Observing, e.g. monitoring, the workpiece
- B23K26/034—Observing the temperature of the workpiece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
- B23K2101/38—Conductors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/10—Aluminium or alloys thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Laser Beam Processing (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a multi-layer tab laser welding device of a power battery cover plate, which comprises a laser welding head, a first pressing mechanism and a second pressing mechanism; the laser welding head is used for welding the multi-layer lug on the pole post of the power battery cover plate, and the first pressing mechanism and the second pressing mechanism are used for pressing two sides of a welding area of the multi-layer lug in the welding process; the first pressing mechanism comprises a first air cylinder, a first compression bar mechanism and a first roller, and the first air cylinder acts on one side of a welding area of the multilayer lug through the first compression bar mechanism and the first roller; the second pressing mechanism comprises a second air cylinder, a second pressing rod mechanism and a second roller, and the second air cylinder acts on the other side of the welding area of the multilayer lug through the second pressing rod mechanism and the second roller. The invention does not need ultrasonic wave pre-welding, can prevent the multilayer tab material from being deformed and swelled by heat to form a bulge, has high yield, can reduce the problems of increased internal resistance and heating of the battery, and prolongs the service life of the battery.
Description
Technical Field
The invention relates to the technical field of welding equipment of power battery cover plates, in particular to a laser welding device and a laser welding process for a multilayer tab of a power battery cover plate.
Background
The power battery cover plate of the square power battery is provided with a positive pole and a negative pole, the positive pole is usually a copper pole, the negative pole is usually an aluminum pole, and when the square power battery is manufactured, the copper pole is required to be flexibly connected with a copper pole lug, and the aluminum pole lug is flexibly connected with the aluminum pole lug. In order to enhance the power storage capacity and output power of the power battery, a technician usually uses a plurality of layers of copper foils as positive lugs to be welded on a copper pole column of a power battery cover plate, and uses a plurality of layers of aluminum foils as negative lugs to be welded on an aluminum pole column of the power battery cover plate.
At present, when a plurality of layers of copper foil or aluminum foil are welded on a copper pole or an aluminum pole of a power battery cover plate, a laser welding device is used for welding. Referring to fig. 1, a multi-layer copper foil or aluminum foil 1 'is firstly placed on a copper pole or aluminum pole 2' of a power battery cover plate, then two ends of the copper foil or aluminum foil 1 'are compressed by a compressing mechanism 3', then a concentrated laser beam 5 'of a laser welding head 4' is aligned with a welding part of the multi-layer copper foil or aluminum foil 1', and finally welding of the multi-layer copper foil or aluminum foil 1' is completed, so that flexible connection of the pole lugs is achieved. However, in the laser welding process, a high temperature region is formed at the welding position of the multi-layer copper foil or aluminum foil, and the welding position of the multi-layer copper foil or aluminum foil is easily bulged under the action of thermal expansion and cold contraction due to the existence of gaps in the multi-layer copper foil or aluminum foil, so that bulge 6' is formed, and poor welding of the multi-layer tab is caused.
In view of this, the skilled artisan welds the multi-layered copper foil or aluminum foil together using an ultrasonic welding apparatus prior to laser welding the multi-layered copper foil or aluminum foil to the copper or aluminum post. This reduces the problem of bulging of the welded portion of the multi-layered copper foil or aluminum foil during laser welding. However, the ultrasonic welding equipment is used for welding the multi-layer copper foil or aluminum foil, so that not only is the ultrasonic welding process increased and the welding cost increased, but also the problem of bulge at the welding part of the multi-layer copper foil or aluminum foil cannot be completely eradicated, and the high laser welding reject ratio still exists.
Disclosure of Invention
According to the technical problems of the prior art, the invention provides the multi-layer tab laser welding device of the power battery cover plate, which does not need to use ultrasonic waves for pre-welding, can prevent the multi-layer tab material from being deformed and swelled by heat to form a bulge, has high yield, can reduce the problems of increased internal resistance and heating of the battery in the use process, and improves the service life of the power battery. Therefore, the invention also provides a welding process of the multi-layer tab laser welding device.
In order to solve the first technical problem, the technical scheme of the invention is as follows: a multi-layer tab laser welding device of a power battery cover plate comprises a laser welding head, a first pressing mechanism and a second pressing mechanism; the laser welding head is used for welding the multi-layer tab on the pole of the power battery cover plate, the first pressing mechanism is used for pressing one side of the welding area of the multi-layer tab in the welding process, and the second pressing mechanism is used for pressing the other side of the welding area of the multi-layer tab in the welding process; wherein:
The first pressing mechanism comprises a first air cylinder, a first pressure rod mechanism and a first roller, the first air cylinder is connected with the upper end of the first pressure rod mechanism, the first roller is rotatably positioned at the lower end of the first pressure rod mechanism, and the first air cylinder acts on one side of a welding area of the multilayer lug through the first pressure rod mechanism and the first roller;
The second pressing mechanism comprises a second air cylinder, a second pressing rod mechanism and a second roller, the second air cylinder is connected with the upper end of the second pressing rod mechanism, the second roller is rotatably positioned at the lower end of the second pressing rod mechanism, and the second air cylinder acts on the other side of the welding area of the multilayer lug through the second pressing rod mechanism and the second roller.
Preferably, a first spring mechanism is arranged on the first pressing mechanism, so that win-win extrusion is realized between the first cylinder and the first roller; and a second spring mechanism is arranged on the second pressing mechanism, so that a win-win extrusion effect is realized between the second cylinder and the second roller.
Preferably, an infrared temperature sensor is arranged on one side of the laser welding head and used for detecting the temperature of the welding area.
Preferably, a thermosensitive temperature sensor is arranged on one side of the welding area and used for detecting the temperature of the welding area.
Preferably, the first roller is further connected with a first motor, and the first motor is used for driving the first roller to rotate; the second roller is also connected with a second motor, and the second motor is used for driving the second roller to rotate.
In order to solve the second technical problem, the technical scheme of the invention is as follows: the laser welding process of the multilayer tab laser welding device of the power battery cover plate comprises the following process steps:
s1, arranging a plurality of layers of lugs on a pole column of a power battery cover plate;
s2, pressing a first roller of a first pressing mechanism on one side of a welding area of the multilayer lug, and pressing a second roller of a second pressing mechanism on the other side of the welding area of the multilayer lug;
S3, aligning laser beams collected by the laser welding head to a welding area of the multilayer lug for laser welding;
S4, in the welding process, the welding area of the multilayer lug is heated and expanded to form stress which is extruded to two sides of the welding area, wherein the stress on one side acts on the lower side of the first roller to promote the first roller to rotate, so that the stress on the side is released; the stress on the other side acts on the lower side of the second roller to drive the second roller to rotate, so that the stress on the side is released;
s5, completing laser welding of the multilayer lugs of the power battery cover plate, and resetting the first pressing mechanism and the second pressing mechanism.
Preferably, the pole is an aluminum pole, and the multi-layer pole lug is formed by superposing 6-16 layers of aluminum foils with the thickness of 0.2 mm; in the welding process, the control system detects the temperature of the welding area of the multilayer lug through the temperature sensor, and when the temperature rises to a first temperature set value, the pressure of the first cylinder to the first roller and the pressure of the second cylinder to the second roller are reduced simultaneously, and the first temperature set value is lower than the melting point temperature value of aluminum.
Preferably, the electrode post is a copper electrode post, and the multilayer electrode lug is formed by stacking 6-16 layers of copper foils with the thickness of 0.2 mm; in the welding process, the control system detects the temperature of the welding area of the multilayer lug through the temperature sensor, and when the temperature rises to a second temperature set value, the pressure of the first cylinder to the first roller and the pressure of the second cylinder to the second roller are reduced at the same time, and the second temperature set value is lower than the melting point temperature value of copper.
Preferably, in the welding process, the first roller is driven to rotate by one motor, and the second roller is driven to rotate by the other motor, so that the first roller and the second roller actively release the stress of the welding area, which is extruded to two sides after heating and expanding.
The beneficial effects of the invention are as follows: the first compression mechanism and the second compression mechanism are respectively arranged at the two sides of the laser welding area, the first compression mechanism comprises the first cylinder, the first compression bar mechanism and the first roller which are sequentially connected, and the second compression mechanism comprises the second cylinder, the second compression bar mechanism and the second roller which are sequentially connected, so that the stress which is generated by the welding area of the multilayer tab and is extruded towards the two sides in the process of welding the multilayer tab by laser can be timely released under the rotation action of the first roller and the second roller, the laser welding device does not need to use ultrasonic wave for pre-welding, the problem that the multilayer tab material is heated, deformed and swelled to form a bump can be avoided, the yield is high, the problem that the internal resistance of a battery is increased and generates heat in the use process can be reduced, and the service life of the power battery is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of a laser welding device for a multi-layer tab of a power battery cover plate in the prior art.
Fig. 2 is a schematic structural view of a laser welding device for a multi-layered tab of a power battery cover plate according to the present invention.
In the figure: the prior art comprises the following steps: 1' a plurality of layers of copper foil or aluminum foil; 2' copper or aluminum poles; a 3' hold-down mechanism; 4' a laser welding head; a 5' laser beam; 6' bulge.
The invention comprises the following steps: 1. a laser welding head; 2. a first hold-down mechanism; 21. a first cylinder; 221. a first spring mechanism; 22. a first compression bar mechanism; 23. a first roller; 3. a second hold-down mechanism; 31. a second cylinder; 32. a second compression bar mechanism; 321. a second spring mechanism; 33. a second roller; 4. a multi-layer tab; 5. a power battery cover plate; 6. a pole; 7. a welding region; 8. an infrared temperature sensor.
Detailed Description
The structural and operational principles of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 2, the invention relates to a multi-layer tab laser welding device of a power battery cover plate, which comprises a laser welding head 1, a first pressing mechanism 2 and a second pressing mechanism 3; the laser welding head 1 is used for welding the multi-layer tab 4 on the pole column 6 of the power battery cover plate 5, the first pressing mechanism 2 is used for pressing one side of the welding area 7 of the multi-layer tab 4 in the welding process, and the second pressing mechanism 3 is used for pressing the other side of the welding area 7 of the multi-layer tab 4 in the welding process; wherein:
the first pressing mechanism 2 comprises a first air cylinder 21, a first pressing rod mechanism 22 and a first roller 23, wherein the first air cylinder 21 is connected with the upper end of the first pressing rod mechanism 22, the first roller 23 is rotatably positioned at the lower end of the first pressing rod mechanism 22, and the first air cylinder 21 applies air cylinder pressure to one side of the welding area 7 of the multilayer tab 4 after passing through the first pressing rod mechanism 22 and the first roller 23;
the second pressing mechanism 3 comprises a second cylinder 31, a second pressing rod mechanism 32 and a second roller 33, the second cylinder 31 is connected with the upper end of the second pressing rod mechanism 32, the second roller 33 is rotatably positioned at the lower end of the second pressing rod mechanism 32, and the second cylinder 31 applies pressure on the other side of the welding area 7 of the multilayer tab 4 after passing through the second pressing rod mechanism 32 and the second roller 33.
In the welding process of the multilayer tab, when the temperature rises, the welding area of the multilayer tab heats and expands to form stress F which is extruded to two sides of the welding area, wherein the stress F on one side acts on the lower side of the first roller to promote the first roller to rotate, so that the stress F on the side is released; the stress F on the other side acts on the lower side of the second roller to drive the second roller to rotate, so that the stress F on the side is released.
As shown in fig. 2, the first pressing mechanism 22 is provided with a first spring mechanism 221, so that the first cylinder 21 and the first roller 23 have win-win extrusion effect; the second pressing mechanism 32 is provided with a second spring mechanism 321, so that the second cylinder 31 and the second roller 33 have win-win extrusion effect.
As shown in fig. 2, an infrared temperature sensor 8 is arranged at one side of the laser welding head and is used for detecting the temperature of the welding area 7; or a heat-sensitive temperature sensor (not shown) is provided on one side of the welding area for temperature detection of the welding area 7. The infrared temperature sensor 8 or the thermosensitive temperature sensor sends the detected temperature to the control system, and the control system performs pressure control on the first cylinder of the first pressing mechanism and the second cylinder of the second pressing mechanism.
As shown in fig. 2, a first motor (not shown) is also connected to the first roller 23, and the first motor is used for driving the first roller 23 to rotate; the second roller 33 is further connected to a second motor (not shown) for driving the second roller 33 to rotate. In the welding process, the first roller is driven to rotate by one motor, and the second roller is driven to rotate by the other motor, so that the first roller and the second roller actively release the stress of the welding area, which is extruded to two sides after heating and expanding.
The invention relates to a laser welding process of a multi-layer tab laser welding device of a power battery cover plate, which comprises the following process steps:
s1, arranging a plurality of layers of lugs on a pole column of a power battery cover plate;
s2, pressing a first roller of a first pressing mechanism on one side of a welding area of the multilayer lug, and pressing a second roller of a second pressing mechanism on the other side of the welding area of the multilayer lug;
S3, aligning a laser beam 9 collected by a laser welding head to a welding area of the multilayer lug for laser welding;
S4, in the welding process, the welding area of the multilayer lug is heated and expanded to form stress which is extruded to two sides of the welding area, wherein the stress on one side acts on the lower side of the first roller to promote the first roller to rotate, so that the stress on the side is released; the stress on the other side acts on the lower side of the second roller to drive the second roller to rotate, so that the stress on the side is released;
s5, completing laser welding of the multilayer lugs of the power battery cover plate, and resetting the first pressing mechanism and the second pressing mechanism.
As a preferable mode of the laser welding process, the pole is an aluminum pole, and the multilayer pole lug is formed by superposing 6-16 layers of aluminum foils with the thickness of 0.2 mm; in the welding process, the control system detects the temperature of the welding area of the multilayer lug through the temperature sensor, and when the temperature rises to a first temperature set value, the pressure of the first cylinder to the first roller and the pressure of the second cylinder to the second roller are reduced simultaneously, and the first temperature set value is lower than the melting point temperature value of aluminum. For example, aluminum has a melting point of 660 c, the first temperature set point may be set to between 500 c and 620 c.
As another preferable mode of the laser welding process, the electrode post is a copper electrode post, and the multilayer electrode lug is formed by superposing 6-16 layers of copper foils with the thickness of 0.2 mm; in the welding process, the control system detects the temperature of the welding area of the multilayer lug through the temperature sensor, and when the temperature rises to a second temperature set value, the pressure of the first cylinder to the first roller and the pressure of the second cylinder to the second roller are reduced at the same time, and the second temperature set value is lower than the melting point temperature value of copper. For example, aluminum has a melting point of 1083 c, the second temperature set point may be set to between 850-1030 c.
As another preferable mode of the laser welding process, in the welding process, the first roller is driven to rotate by one motor, and the second roller is driven to rotate by the other motor, so that the first roller and the second roller actively release the stress of the welding area which is extruded to two sides after heating and expanding.
In the foregoing, only the preferred embodiment of the present invention is described, and any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical solutions of the present invention fall within the scope of the technical solutions of the present invention.
Claims (8)
1. A multilayer tab laser welding device of a power battery cover plate is characterized in that: comprises a laser welding head, a first pressing mechanism and a second pressing mechanism; the laser welding head is used for welding the multi-layer tab on the pole of the power battery cover plate, the first pressing mechanism is used for pressing one side of the welding area of the multi-layer tab in the welding process, and the second pressing mechanism is used for pressing the other side of the welding area of the multi-layer tab in the welding process; wherein:
The first pressing mechanism comprises a first air cylinder, a first pressure rod mechanism and a first roller, the first air cylinder is connected with the upper end of the first pressure rod mechanism, the first roller is rotatably positioned at the lower end of the first pressure rod mechanism, and the first air cylinder acts on one side of a welding area of the multilayer lug through the first pressure rod mechanism and the first roller;
The second pressing mechanism comprises a second air cylinder, a second pressing rod mechanism and a second roller, the second air cylinder is connected with the upper end of the second pressing rod mechanism, the second roller is rotatably positioned at the lower end of the second pressing rod mechanism, and the second air cylinder acts on the other side of the welding area of the multilayer lug through the second pressing rod mechanism and the second roller;
The laser welding process of the multilayer tab laser welding device of the power battery cover plate comprises the following process steps:
s1, arranging a plurality of layers of lugs on a pole column of a power battery cover plate;
s2, pressing a first roller of a first pressing mechanism on one side of a welding area of the multilayer lug, and pressing a second roller of a second pressing mechanism on the other side of the welding area of the multilayer lug;
S3, aligning laser beams collected by the laser welding head to a welding area of the multilayer lug for laser welding;
S4, in the welding process, the welding area of the multilayer lug is heated and expanded to form stress which is extruded to two sides of the welding area, wherein the stress on one side acts on the lower side of the first roller to promote the first roller to rotate, so that the stress on the side is released; the stress on the other side acts on the lower side of the second roller to drive the second roller to rotate, so that the stress on the side is released;
S5, completing laser welding of multiple layers of lugs of the power battery cover plate, and resetting the first pressing mechanism and the second pressing mechanism;
The pole is an aluminum pole, and the multi-layer pole lug is formed by superposing 6-16 layers of aluminum foils with the thickness of 0.2 mm; in the welding process, the control system detects the temperature of a welding area of the multilayer lug through a temperature sensor, and when the temperature is increased to a first temperature set value, the pressure of a first cylinder to a first roller and the pressure of a second cylinder to a second roller are simultaneously reduced, wherein the first temperature set value is lower than the melting point temperature value of aluminum and is between 500 and 620 ℃;
The first roller is also connected with a first motor, and the first motor is used for driving the first roller to rotate; the second roller is also connected with a second motor, and the second motor is used for driving the second roller to rotate; in the welding process, the first motor drives the first roller to rotate, and the second motor drives the second roller to rotate, so that the first roller and the second roller actively release the stress of the welding area, which is extruded to two sides after heating and expanding.
2. The multi-layered tab laser welding device for a power cell cover plate according to claim 1, wherein: the first pressing mechanism is provided with a first spring mechanism, so that a win-win extrusion effect is achieved between the first cylinder and the first roller; and a second spring mechanism is arranged on the second pressing mechanism, so that a win-win extrusion effect is realized between the second cylinder and the second roller.
3. The multi-layered tab laser welding device for a power cell cover plate according to claim 1, wherein: and one side of the laser welding head is provided with an infrared temperature sensor for detecting the temperature of the welding area.
4. The multi-layered tab laser welding device for a power cell cover plate according to claim 1, wherein: and one side of the welding area is provided with a thermosensitive temperature sensor for detecting the temperature of the welding area.
5. A multilayer tab laser welding device of a power battery cover plate is characterized in that: comprises a laser welding head, a first pressing mechanism and a second pressing mechanism; the laser welding head is used for welding the multi-layer tab on the pole of the power battery cover plate, the first pressing mechanism is used for pressing one side of the welding area of the multi-layer tab in the welding process, and the second pressing mechanism is used for pressing the other side of the welding area of the multi-layer tab in the welding process; wherein:
The first pressing mechanism comprises a first air cylinder, a first pressure rod mechanism and a first roller, the first air cylinder is connected with the upper end of the first pressure rod mechanism, the first roller is rotatably positioned at the lower end of the first pressure rod mechanism, and the first air cylinder acts on one side of a welding area of the multilayer lug through the first pressure rod mechanism and the first roller;
The second pressing mechanism comprises a second air cylinder, a second pressing rod mechanism and a second roller, the second air cylinder is connected with the upper end of the second pressing rod mechanism, the second roller is rotatably positioned at the lower end of the second pressing rod mechanism, and the second air cylinder acts on the other side of the welding area of the multilayer lug through the second pressing rod mechanism and the second roller;
The laser welding process of the multilayer tab laser welding device of the power battery cover plate comprises the following process steps:
s1, arranging a plurality of layers of lugs on a pole column of a power battery cover plate;
s2, pressing a first roller of a first pressing mechanism on one side of a welding area of the multilayer lug, and pressing a second roller of a second pressing mechanism on the other side of the welding area of the multilayer lug;
S3, aligning laser beams collected by the laser welding head to a welding area of the multilayer lug for laser welding;
S4, in the welding process, the welding area of the multilayer lug is heated and expanded to form stress which is extruded to two sides of the welding area, wherein the stress on one side acts on the lower side of the first roller to promote the first roller to rotate, so that the stress on the side is released; the stress on the other side acts on the lower side of the second roller to drive the second roller to rotate, so that the stress on the side is released;
S5, completing laser welding of multiple layers of lugs of the power battery cover plate, and resetting the first pressing mechanism and the second pressing mechanism;
The electrode post is a copper electrode post, and the multilayer electrode lug is formed by superposing 6-16 layers of copper foils with the thickness of 0.2 mm; in the welding process, the control system detects the temperature of a welding area of the multilayer lug through a temperature sensor, and when the temperature is increased to a second temperature set value, the pressure of the first cylinder to the first roller and the pressure of the second cylinder to the second roller are simultaneously reduced, and the second temperature set value is lower than the melting point temperature value of copper and is between 850 and 1030 ℃;
The first roller is also connected with a first motor, and the first motor is used for driving the first roller to rotate; the second roller is also connected with a second motor, and the second motor is used for driving the second roller to rotate; in the welding process, the first motor drives the first roller to rotate, and the second motor drives the second roller to rotate, so that the first roller and the second roller actively release the stress of the welding area, which is extruded to two sides after heating and expanding.
6. The power cell cover plate multilayer tab laser welding device of claim 5 wherein: the first pressing mechanism is provided with a first spring mechanism, so that a win-win extrusion effect is achieved between the first cylinder and the first roller; and a second spring mechanism is arranged on the second pressing mechanism, so that a win-win extrusion effect is realized between the second cylinder and the second roller.
7. The power cell cover plate multilayer tab laser welding device of claim 5 wherein: and one side of the laser welding head is provided with an infrared temperature sensor for detecting the temperature of the welding area.
8. The power cell cover plate multilayer tab laser welding device of claim 5 wherein: and one side of the welding area is provided with a thermosensitive temperature sensor for detecting the temperature of the welding area.
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